OpenAI: GPT-5.1-Codex-Mini wins on more metrics (7 of 9), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | Mistral: Mistral Medium 3.5 | OpenAI: GPT-5.1-Codex-Mini |
|---|---|---|
| Intelligence Index | 39.2✓ | 38.6 |
| Coding Index | 35.4 | 36.4✓ |
| GPQA Diamond | 75% | 81%✓ |
| Design Arena Elo | — | 1162✓ |
| Speed (tokens/sec) | 47 | 121✓ |
| Latency | 691ms✓ | 1.7s |
| Input price /M | $1.50 | $0.250✓ |
| Output price /M | $7.50 | $2.00✓ |
| Context window | 262K | 400K✓ |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsJSONVision |